Simplify Jenkinsfile for ci.jenkins.io

[Jagrutiti]

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

Verified the changes by running mvn test.

It was taking a long time, so I stopped the test in the middle.

This was the final outcome:

[INFO] 
[INFO] Results:
[INFO]
[WARNING] Tests run: 113, Failures: 0, Errors: 0, Skipped: 1
[INFO]
Terminate batch job (Y/N)? y

[MarkEWaite]

Thanks!